diff --git a/composer.json b/composer.json
index b137c6b..3e701c0 100644
--- a/composer.json
+++ b/composer.json
@@ -40,6 +40,7 @@
         "cdn77/coding-standard": "^7.0",
         "infection/infection": "^0.26.0",
         "nyholm/psr7": "^1.2",
+        "php-http/message-factory": "^1.1",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan": "^1.0.0",
         "phpstan/phpstan-phpunit": "^1.0.0",